text: A 2012 study focusing on 479 green infrastructure projects across the United States found that 44% of green infrastructure projects reduced costs, compared to the 31% that increased the costs. The most notable cost savings were due to reduced stormwater runoff and decreased heating and cooling costs. Green infrastructure is often cheaper than other conventional water management strategies. The city of Philadelphia, for example, discovered that a [https://dirt.asla.org/2013/12/18/the-new-philadelphia-story-is-about-green-infrastructure/ new green infrastructure plan] would cost $1.2 billion over a 25-year period, compared to the $6 billion that would have been needed to finance a grey infrastructure plan.
  A comprehensive green infrastructure in Philadelphia is planned to cost just $1.2 billion over the next 25 years, compared to over $6 billion for "grey" infrastructure (concrete tunnels created to move water). Under the new green infrastructure plan it is expected that:
  *250 people will be employed annually in green jobs.
  *Up to 1.5 billion pounds of carbon dioxide emission to be avoided or absorbed through green infrastructure each year (the equivalent of removing close to 3,400 vehicles from roadways) 
  *Air quality will improve due to all the new trees, green roofs, and parks
  *Communities will benefit on the social and health side 
  *About 20 deaths due to asthma will be avoided
  *250 fewer work or school days will be missed
  *Deaths due to excessive urban heat could also be cut by 250 over 20 years.
  *The new greenery will increase property values by $390 million over 45 years, also boosting the property taxes the city takes in.
  A green infrastructure plan in New York City is expected to cost $1.5 billion less than a comparable grey infrastructure approach. Also, the green stormwater management systems alone will save $1 billion, at a cost of about $0.15 less per gallon. The sustainability benefits in New York City range from $139–418 million over the 20 year life of the project. This green plan estimates that “every fully vegetated acre of green infrastructure would provide total annual benefits of $8.522 in reduced energy demand, $166 in reduced CO2 emissions, $1,044 in improved air quality, and $4,725 in increased property value.”
  In addition to ambitious infrastructure plans and layouts offering economical and health benefits with the investment of green infrastructure, a study conducted in 2016 within the United Kingdom analyzed the "willingness-to-pay" capacity held by residents in response to green infrastructure. Their findings concluded that, "investment in urban [green infrastructure] that is visibly greener, that facilitates access to [green infrastructure] and other amenities, and that is perceived to promote multiple functions and benefits on a single site (i.e. multi-functionality) generate higher [willingness-to-pay] values." The "willingness-to-pay" obligation is pronounced with the idea that the locations of some living spaces with functionality and aesthetics are more likely to wield larger amounts of social and economical capital. By incentivising residents to invest in green infrastructure within their own zones for development and communities, it allows the potential for increased revenue to be used in order to facilitate further green infrastructure, ultimately increasing the "economic viability" for future projects to occur.